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1 | 203cdba3 | Jeff Cody | /*
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2 | 203cdba3 | Jeff Cody | * Block driver for Hyper-V VHDX Images
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3 | 203cdba3 | Jeff Cody | *
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4 | 203cdba3 | Jeff Cody | * Copyright (c) 2013 Red Hat, Inc.,
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5 | 203cdba3 | Jeff Cody | *
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6 | 203cdba3 | Jeff Cody | * Authors:
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7 | 203cdba3 | Jeff Cody | * Jeff Cody <jcody@redhat.com>
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8 | 203cdba3 | Jeff Cody | *
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9 | 6e9d290b | Jeff Cody | * This is based on the "VHDX Format Specification v1.00", published 8/25/2012
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10 | 203cdba3 | Jeff Cody | * by Microsoft:
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11 | 6e9d290b | Jeff Cody | * https://www.microsoft.com/en-us/download/details.aspx?id=34750
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12 | 203cdba3 | Jeff Cody | *
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13 | 203cdba3 | Jeff Cody | * This work is licensed under the terms of the GNU LGPL, version 2 or later.
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14 | 203cdba3 | Jeff Cody | * See the COPYING.LIB file in the top-level directory.
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15 | 203cdba3 | Jeff Cody | *
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16 | 203cdba3 | Jeff Cody | */
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17 | 203cdba3 | Jeff Cody | |
18 | 203cdba3 | Jeff Cody | #ifndef BLOCK_VHDX_H
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19 | 203cdba3 | Jeff Cody | #define BLOCK_VHDX_H
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20 | 203cdba3 | Jeff Cody | |
21 | 3412f7b1 | Jeff Cody | #define KiB (1 * 1024) |
22 | 3412f7b1 | Jeff Cody | #define MiB (KiB * 1024) |
23 | 3412f7b1 | Jeff Cody | #define GiB (MiB * 1024) |
24 | 3412f7b1 | Jeff Cody | #define TiB ((uint64_t) GiB * 1024) |
25 | 3412f7b1 | Jeff Cody | |
26 | 203cdba3 | Jeff Cody | /* Structures and fields present in the VHDX file */
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27 | 203cdba3 | Jeff Cody | |
28 | 203cdba3 | Jeff Cody | /* The header section has the following blocks,
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29 | 203cdba3 | Jeff Cody | * each block is 64KB:
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30 | 203cdba3 | Jeff Cody | *
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31 | 203cdba3 | Jeff Cody | * _____________________________________________________________________________
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32 | 203cdba3 | Jeff Cody | * | File Id. | Header 1 | Header 2 | Region Table | Reserved (768KB) |
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33 | 203cdba3 | Jeff Cody | * |----------|---------------|------------|--------------|--------------------|
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34 | 203cdba3 | Jeff Cody | * | | | | | |
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35 | 203cdba3 | Jeff Cody | * 0.........64KB...........128KB........192KB..........256KB................1MB
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36 | 203cdba3 | Jeff Cody | */
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37 | 203cdba3 | Jeff Cody | |
38 | 625565d2 | Jeff Cody | #define VHDX_HEADER_BLOCK_SIZE (64 * 1024) |
39 | 203cdba3 | Jeff Cody | |
40 | 203cdba3 | Jeff Cody | #define VHDX_FILE_ID_OFFSET 0 |
41 | 625565d2 | Jeff Cody | #define VHDX_HEADER1_OFFSET (VHDX_HEADER_BLOCK_SIZE * 1) |
42 | 625565d2 | Jeff Cody | #define VHDX_HEADER2_OFFSET (VHDX_HEADER_BLOCK_SIZE * 2) |
43 | 625565d2 | Jeff Cody | #define VHDX_REGION_TABLE_OFFSET (VHDX_HEADER_BLOCK_SIZE * 3) |
44 | 3412f7b1 | Jeff Cody | #define VHDX_REGION_TABLE2_OFFSET (VHDX_HEADER_BLOCK_SIZE * 4) |
45 | 203cdba3 | Jeff Cody | |
46 | 3412f7b1 | Jeff Cody | #define VHDX_HEADER_SECTION_END (1 * MiB) |
47 | 203cdba3 | Jeff Cody | /*
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48 | 203cdba3 | Jeff Cody | * A note on the use of MS-GUID fields. For more details on the GUID,
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49 | 203cdba3 | Jeff Cody | * please see: https://en.wikipedia.org/wiki/Globally_unique_identifier.
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50 | 203cdba3 | Jeff Cody | *
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51 | 203cdba3 | Jeff Cody | * The VHDX specification only states that these are MS GUIDs, and which
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52 | 203cdba3 | Jeff Cody | * bytes are data1-data4. It makes no mention of what algorithm should be used
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53 | 203cdba3 | Jeff Cody | * to generate the GUID, nor what standard. However, looking at the specified
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54 | 203cdba3 | Jeff Cody | * known GUID fields, it appears the GUIDs are:
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55 | 203cdba3 | Jeff Cody | * Standard/DCE GUID type (noted by 10b in the MSB of byte 0 of .data4)
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56 | 203cdba3 | Jeff Cody | * Random algorithm (noted by 0x4XXX for .data3)
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57 | 203cdba3 | Jeff Cody | */
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58 | 203cdba3 | Jeff Cody | |
59 | 203cdba3 | Jeff Cody | /* ---- HEADER SECTION STRUCTURES ---- */
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60 | 203cdba3 | Jeff Cody | |
61 | 203cdba3 | Jeff Cody | /* These structures are ones that are defined in the VHDX specification
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62 | 203cdba3 | Jeff Cody | * document */
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63 | 203cdba3 | Jeff Cody | |
64 | 3412f7b1 | Jeff Cody | #define VHDX_FILE_SIGNATURE 0x656C696678646876 /* "vhdxfile" in ASCII */ |
65 | 203cdba3 | Jeff Cody | typedef struct VHDXFileIdentifier { |
66 | 203cdba3 | Jeff Cody | uint64_t signature; /* "vhdxfile" in ASCII */
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67 | 203cdba3 | Jeff Cody | uint16_t creator[256]; /* optional; utf-16 string to identify |
68 | 61c02e56 | Jeff Cody | the vhdx file creator. Diagnostic
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69 | 203cdba3 | Jeff Cody | only */
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70 | 203cdba3 | Jeff Cody | } VHDXFileIdentifier; |
71 | 203cdba3 | Jeff Cody | |
72 | 203cdba3 | Jeff Cody | |
73 | 203cdba3 | Jeff Cody | /* the guid is a 16 byte unique ID - the definition for this used by
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74 | 203cdba3 | Jeff Cody | * Microsoft is not just 16 bytes though - it is a structure that is defined,
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75 | 203cdba3 | Jeff Cody | * so we need to follow it here so that endianness does not trip us up */
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76 | 203cdba3 | Jeff Cody | |
77 | 4f18b782 | Jeff Cody | typedef struct QEMU_PACKED MSGUID { |
78 | 203cdba3 | Jeff Cody | uint32_t data1; |
79 | 203cdba3 | Jeff Cody | uint16_t data2; |
80 | 203cdba3 | Jeff Cody | uint16_t data3; |
81 | 203cdba3 | Jeff Cody | uint8_t data4[8];
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82 | 203cdba3 | Jeff Cody | } MSGUID; |
83 | 203cdba3 | Jeff Cody | |
84 | 203cdba3 | Jeff Cody | #define guid_eq(a, b) \
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85 | 203cdba3 | Jeff Cody | (memcmp(&(a), &(b), sizeof(MSGUID)) == 0) |
86 | 203cdba3 | Jeff Cody | |
87 | 625565d2 | Jeff Cody | #define VHDX_HEADER_SIZE (4 * 1024) /* although the vhdx_header struct in disk |
88 | 625565d2 | Jeff Cody | is only 582 bytes, for purposes of crc
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89 | 625565d2 | Jeff Cody | the header is the first 4KB of the 64KB
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90 | 625565d2 | Jeff Cody | block */
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91 | 203cdba3 | Jeff Cody | |
92 | 203cdba3 | Jeff Cody | /* The full header is 4KB, although the actual header data is much smaller.
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93 | 203cdba3 | Jeff Cody | * But for the checksum calculation, it is over the entire 4KB structure,
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94 | 203cdba3 | Jeff Cody | * not just the defined portion of it */
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95 | 3412f7b1 | Jeff Cody | #define VHDX_HEADER_SIGNATURE 0x64616568 |
96 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXHeader { |
97 | 203cdba3 | Jeff Cody | uint32_t signature; /* "head" in ASCII */
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98 | 203cdba3 | Jeff Cody | uint32_t checksum; /* CRC-32C hash of the whole header */
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99 | 203cdba3 | Jeff Cody | uint64_t sequence_number; /* Seq number of this header. Each
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100 | 203cdba3 | Jeff Cody | VHDX file has 2 of these headers,
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101 | 203cdba3 | Jeff Cody | and only the header with the highest
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102 | 203cdba3 | Jeff Cody | sequence number is valid */
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103 | 625565d2 | Jeff Cody | MSGUID file_write_guid; /* 128 bit unique identifier. Must be
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104 | 203cdba3 | Jeff Cody | updated to new, unique value before
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105 | 203cdba3 | Jeff Cody | the first modification is made to
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106 | 203cdba3 | Jeff Cody | file */
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107 | 203cdba3 | Jeff Cody | MSGUID data_write_guid; /* 128 bit unique identifier. Must be
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108 | 203cdba3 | Jeff Cody | updated to new, unique value before
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109 | 203cdba3 | Jeff Cody | the first modification is made to
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110 | 203cdba3 | Jeff Cody | visible data. Visbile data is
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111 | 203cdba3 | Jeff Cody | defined as:
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112 | 203cdba3 | Jeff Cody | - system & user metadata
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113 | 203cdba3 | Jeff Cody | - raw block data
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114 | 203cdba3 | Jeff Cody | - disk size
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115 | 203cdba3 | Jeff Cody | - any change that will
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116 | 203cdba3 | Jeff Cody | cause the virtual disk
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117 | 203cdba3 | Jeff Cody | sector read to differ
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118 | 203cdba3 | Jeff Cody | |
119 | 203cdba3 | Jeff Cody | This does not need to change if
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120 | 203cdba3 | Jeff Cody | blocks are re-arranged */
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121 | 203cdba3 | Jeff Cody | MSGUID log_guid; /* 128 bit unique identifier. If zero,
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122 | 203cdba3 | Jeff Cody | there is no valid log. If non-zero,
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123 | 203cdba3 | Jeff Cody | log entries with this guid are
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124 | 203cdba3 | Jeff Cody | valid. */
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125 | 61c02e56 | Jeff Cody | uint16_t log_version; /* version of the log format. Must be
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126 | 61c02e56 | Jeff Cody | set to zero */
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127 | 6e9d290b | Jeff Cody | uint16_t version; /* version of the vhdx file. Currently,
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128 | 203cdba3 | Jeff Cody | only supported version is "1" */
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129 | 203cdba3 | Jeff Cody | uint32_t log_length; /* length of the log. Must be multiple
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130 | 203cdba3 | Jeff Cody | of 1MB */
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131 | 203cdba3 | Jeff Cody | uint64_t log_offset; /* byte offset in the file of the log.
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132 | 203cdba3 | Jeff Cody | Must also be a multiple of 1MB */
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133 | 203cdba3 | Jeff Cody | } VHDXHeader; |
134 | 203cdba3 | Jeff Cody | |
135 | 203cdba3 | Jeff Cody | /* Header for the region table block */
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136 | 3412f7b1 | Jeff Cody | #define VHDX_REGION_SIGNATURE 0x69676572 /* "regi" in ASCII */ |
137 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXRegionTableHeader { |
138 | 203cdba3 | Jeff Cody | uint32_t signature; /* "regi" in ASCII */
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139 | 203cdba3 | Jeff Cody | uint32_t checksum; /* CRC-32C hash of the 64KB table */
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140 | 203cdba3 | Jeff Cody | uint32_t entry_count; /* number of valid entries */
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141 | 203cdba3 | Jeff Cody | uint32_t reserved; |
142 | 203cdba3 | Jeff Cody | } VHDXRegionTableHeader; |
143 | 203cdba3 | Jeff Cody | |
144 | 203cdba3 | Jeff Cody | /* Individual region table entry. There may be a maximum of 2047 of these
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145 | 203cdba3 | Jeff Cody | *
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146 | 203cdba3 | Jeff Cody | * There are two known region table properties. Both are required.
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147 | 203cdba3 | Jeff Cody | * BAT (block allocation table): 2DC27766F62342009D64115E9BFD4A08
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148 | 203cdba3 | Jeff Cody | * Metadata: 8B7CA20647904B9AB8FE575F050F886E
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149 | 203cdba3 | Jeff Cody | */
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150 | 203cdba3 | Jeff Cody | #define VHDX_REGION_ENTRY_REQUIRED 0x01 /* if set, parser must understand |
151 | 203cdba3 | Jeff Cody | this entry in order to open
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152 | 203cdba3 | Jeff Cody | file */
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153 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXRegionTableEntry { |
154 | 203cdba3 | Jeff Cody | MSGUID guid; /* 128-bit unique identifier */
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155 | 203cdba3 | Jeff Cody | uint64_t file_offset; /* offset of the object in the file.
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156 | 203cdba3 | Jeff Cody | Must be multiple of 1MB */
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157 | 203cdba3 | Jeff Cody | uint32_t length; /* length, in bytes, of the object */
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158 | 203cdba3 | Jeff Cody | uint32_t data_bits; |
159 | 203cdba3 | Jeff Cody | } VHDXRegionTableEntry; |
160 | 203cdba3 | Jeff Cody | |
161 | 203cdba3 | Jeff Cody | |
162 | 203cdba3 | Jeff Cody | /* ---- LOG ENTRY STRUCTURES ---- */
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163 | 625565d2 | Jeff Cody | #define VHDX_LOG_MIN_SIZE (1024 * 1024) |
164 | 625565d2 | Jeff Cody | #define VHDX_LOG_SECTOR_SIZE 4096 |
165 | 203cdba3 | Jeff Cody | #define VHDX_LOG_HDR_SIZE 64 |
166 | 625565d2 | Jeff Cody | #define VHDX_LOG_SIGNATURE 0x65676f6c |
167 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXLogEntryHeader { |
168 | 203cdba3 | Jeff Cody | uint32_t signature; /* "loge" in ASCII */
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169 | 203cdba3 | Jeff Cody | uint32_t checksum; /* CRC-32C hash of the 64KB table */
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170 | 203cdba3 | Jeff Cody | uint32_t entry_length; /* length in bytes, multiple of 1MB */
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171 | 203cdba3 | Jeff Cody | uint32_t tail; /* byte offset of first log entry of a
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172 | 203cdba3 | Jeff Cody | seq, where this entry is the last
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173 | 203cdba3 | Jeff Cody | entry */
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174 | 203cdba3 | Jeff Cody | uint64_t sequence_number; /* incremented with each log entry.
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175 | 203cdba3 | Jeff Cody | May not be zero. */
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176 | 203cdba3 | Jeff Cody | uint32_t descriptor_count; /* number of descriptors in this log
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177 | 203cdba3 | Jeff Cody | entry, must be >= 0 */
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178 | 203cdba3 | Jeff Cody | uint32_t reserved; |
179 | 203cdba3 | Jeff Cody | MSGUID log_guid; /* value of the log_guid from
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180 | 203cdba3 | Jeff Cody | vhdx_header. If not found in
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181 | 203cdba3 | Jeff Cody | vhdx_header, it is invalid */
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182 | 203cdba3 | Jeff Cody | uint64_t flushed_file_offset; /* see spec for full details - this
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183 | 52f35022 | Stefan Weil | should be vhdx file size in bytes */
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184 | 203cdba3 | Jeff Cody | uint64_t last_file_offset; /* size in bytes that all allocated
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185 | 203cdba3 | Jeff Cody | file structures fit into */
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186 | 203cdba3 | Jeff Cody | } VHDXLogEntryHeader; |
187 | 203cdba3 | Jeff Cody | |
188 | 203cdba3 | Jeff Cody | #define VHDX_LOG_DESC_SIZE 32 |
189 | 625565d2 | Jeff Cody | #define VHDX_LOG_DESC_SIGNATURE 0x63736564 |
190 | 625565d2 | Jeff Cody | #define VHDX_LOG_ZERO_SIGNATURE 0x6f72657a |
191 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXLogDescriptor { |
192 | 203cdba3 | Jeff Cody | uint32_t signature; /* "zero" or "desc" in ASCII */
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193 | 203cdba3 | Jeff Cody | union {
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194 | 203cdba3 | Jeff Cody | uint32_t reserved; /* zero desc */
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195 | 203cdba3 | Jeff Cody | uint32_t trailing_bytes; /* data desc: bytes 4092-4096 of the
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196 | 203cdba3 | Jeff Cody | data sector */
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197 | 203cdba3 | Jeff Cody | }; |
198 | 203cdba3 | Jeff Cody | union {
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199 | 203cdba3 | Jeff Cody | uint64_t zero_length; /* zero desc: length of the section to
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200 | 203cdba3 | Jeff Cody | zero */
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201 | 203cdba3 | Jeff Cody | uint64_t leading_bytes; /* data desc: bytes 0-7 of the data
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202 | 203cdba3 | Jeff Cody | sector */
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203 | 203cdba3 | Jeff Cody | }; |
204 | 203cdba3 | Jeff Cody | uint64_t file_offset; /* file offset to write zeros - multiple
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205 | 203cdba3 | Jeff Cody | of 4kB */
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206 | 203cdba3 | Jeff Cody | uint64_t sequence_number; /* must match same field in
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207 | 203cdba3 | Jeff Cody | vhdx_log_entry_header */
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208 | 203cdba3 | Jeff Cody | } VHDXLogDescriptor; |
209 | 203cdba3 | Jeff Cody | |
210 | 625565d2 | Jeff Cody | #define VHDX_LOG_DATA_SIGNATURE 0x61746164 |
211 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXLogDataSector { |
212 | 203cdba3 | Jeff Cody | uint32_t data_signature; /* "data" in ASCII */
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213 | 203cdba3 | Jeff Cody | uint32_t sequence_high; /* 4 MSB of 8 byte sequence_number */
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214 | 203cdba3 | Jeff Cody | uint8_t data[4084]; /* raw data, bytes 8-4091 (inclusive). |
215 | 203cdba3 | Jeff Cody | see the data descriptor field for the
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216 | 203cdba3 | Jeff Cody | other mising bytes */
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217 | 203cdba3 | Jeff Cody | uint32_t sequence_low; /* 4 LSB of 8 byte sequence_number */
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218 | 203cdba3 | Jeff Cody | } VHDXLogDataSector; |
219 | 203cdba3 | Jeff Cody | |
220 | 203cdba3 | Jeff Cody | |
221 | 203cdba3 | Jeff Cody | |
222 | 203cdba3 | Jeff Cody | /* block states - different state values depending on whether it is a
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223 | 203cdba3 | Jeff Cody | * payload block, or a sector block. */
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224 | 203cdba3 | Jeff Cody | |
225 | 203cdba3 | Jeff Cody | #define PAYLOAD_BLOCK_NOT_PRESENT 0 |
226 | 203cdba3 | Jeff Cody | #define PAYLOAD_BLOCK_UNDEFINED 1 |
227 | 203cdba3 | Jeff Cody | #define PAYLOAD_BLOCK_ZERO 2 |
228 | 203cdba3 | Jeff Cody | #define PAYLOAD_BLOCK_UNMAPPED 5 |
229 | d92aa883 | Jeff Cody | #define PAYLOAD_BLOCK_FULLY_PRESENT 6 |
230 | 203cdba3 | Jeff Cody | #define PAYLOAD_BLOCK_PARTIALLY_PRESENT 7 |
231 | 203cdba3 | Jeff Cody | |
232 | 203cdba3 | Jeff Cody | #define SB_BLOCK_NOT_PRESENT 0 |
233 | 203cdba3 | Jeff Cody | #define SB_BLOCK_PRESENT 6 |
234 | 203cdba3 | Jeff Cody | |
235 | 203cdba3 | Jeff Cody | /* per the spec */
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236 | 625565d2 | Jeff Cody | #define VHDX_MAX_SECTORS_PER_BLOCK (1 << 23) |
237 | 203cdba3 | Jeff Cody | |
238 | 203cdba3 | Jeff Cody | /* upper 44 bits are the file offset in 1MB units lower 3 bits are the state
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239 | 203cdba3 | Jeff Cody | other bits are reserved */
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240 | 203cdba3 | Jeff Cody | #define VHDX_BAT_STATE_BIT_MASK 0x07 |
241 | 1a848fd4 | Jeff Cody | #define VHDX_BAT_FILE_OFF_MASK 0xFFFFFFFFFFF00000 /* upper 44 bits */ |
242 | 203cdba3 | Jeff Cody | typedef uint64_t VHDXBatEntry;
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243 | 203cdba3 | Jeff Cody | |
244 | 203cdba3 | Jeff Cody | /* ---- METADATA REGION STRUCTURES ---- */
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245 | 203cdba3 | Jeff Cody | |
246 | 203cdba3 | Jeff Cody | #define VHDX_METADATA_ENTRY_SIZE 32 |
247 | 203cdba3 | Jeff Cody | #define VHDX_METADATA_MAX_ENTRIES 2047 /* not including the header */ |
248 | 203cdba3 | Jeff Cody | #define VHDX_METADATA_TABLE_MAX_SIZE \
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249 | 203cdba3 | Jeff Cody | (VHDX_METADATA_ENTRY_SIZE * (VHDX_METADATA_MAX_ENTRIES+1))
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250 | 3412f7b1 | Jeff Cody | #define VHDX_METADATA_SIGNATURE 0x617461646174656D /* "metadata" in ASCII */ |
251 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXMetadataTableHeader { |
252 | 203cdba3 | Jeff Cody | uint64_t signature; /* "metadata" in ASCII */
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253 | 203cdba3 | Jeff Cody | uint16_t reserved; |
254 | 203cdba3 | Jeff Cody | uint16_t entry_count; /* number table entries. <= 2047 */
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255 | 203cdba3 | Jeff Cody | uint32_t reserved2[5];
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256 | 203cdba3 | Jeff Cody | } VHDXMetadataTableHeader; |
257 | 203cdba3 | Jeff Cody | |
258 | 203cdba3 | Jeff Cody | #define VHDX_META_FLAGS_IS_USER 0x01 /* max 1024 entries */ |
259 | 203cdba3 | Jeff Cody | #define VHDX_META_FLAGS_IS_VIRTUAL_DISK 0x02 /* virtual disk metadata if set, |
260 | 203cdba3 | Jeff Cody | otherwise file metdata */
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261 | 203cdba3 | Jeff Cody | #define VHDX_META_FLAGS_IS_REQUIRED 0x04 /* parse must understand this |
262 | 203cdba3 | Jeff Cody | entry to open the file */
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263 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXMetadataTableEntry { |
264 | 203cdba3 | Jeff Cody | MSGUID item_id; /* 128-bit identifier for metadata */
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265 | 203cdba3 | Jeff Cody | uint32_t offset; /* byte offset of the metadata. At
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266 | 203cdba3 | Jeff Cody | least 64kB. Relative to start of
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267 | 203cdba3 | Jeff Cody | metadata region */
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268 | 203cdba3 | Jeff Cody | /* note: if length = 0, so is offset */
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269 | 203cdba3 | Jeff Cody | uint32_t length; /* length of metadata. <= 1MB. */
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270 | 625565d2 | Jeff Cody | uint32_t data_bits; /* least-significant 3 bits are flags,
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271 | 625565d2 | Jeff Cody | the rest are reserved (see above) */
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272 | 203cdba3 | Jeff Cody | uint32_t reserved2; |
273 | 203cdba3 | Jeff Cody | } VHDXMetadataTableEntry; |
274 | 203cdba3 | Jeff Cody | |
275 | 203cdba3 | Jeff Cody | #define VHDX_PARAMS_LEAVE_BLOCKS_ALLOCED 0x01 /* Do not change any blocks to |
276 | 203cdba3 | Jeff Cody | be BLOCK_NOT_PRESENT.
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277 | 203cdba3 | Jeff Cody | If set indicates a fixed
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278 | 203cdba3 | Jeff Cody | size VHDX file */
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279 | 203cdba3 | Jeff Cody | #define VHDX_PARAMS_HAS_PARENT 0x02 /* has parent / backing file */ |
280 | 3412f7b1 | Jeff Cody | #define VHDX_BLOCK_SIZE_MIN (1 * MiB) |
281 | 3412f7b1 | Jeff Cody | #define VHDX_BLOCK_SIZE_MAX (256 * MiB) |
282 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXFileParameters { |
283 | 203cdba3 | Jeff Cody | uint32_t block_size; /* size of each payload block, always
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284 | 203cdba3 | Jeff Cody | power of 2, <= 256MB and >= 1MB. */
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285 | 625565d2 | Jeff Cody | uint32_t data_bits; /* least-significant 2 bits are flags,
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286 | 625565d2 | Jeff Cody | the rest are reserved (see above) */
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287 | 203cdba3 | Jeff Cody | } VHDXFileParameters; |
288 | 203cdba3 | Jeff Cody | |
289 | 3412f7b1 | Jeff Cody | #define VHDX_MAX_IMAGE_SIZE ((uint64_t) 64 * TiB) |
290 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXVirtualDiskSize { |
291 | 203cdba3 | Jeff Cody | uint64_t virtual_disk_size; /* Size of the virtual disk, in bytes.
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292 | 203cdba3 | Jeff Cody | Must be multiple of the sector size,
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293 | 203cdba3 | Jeff Cody | max of 64TB */
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294 | 203cdba3 | Jeff Cody | } VHDXVirtualDiskSize; |
295 | 203cdba3 | Jeff Cody | |
296 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXPage83Data { |
297 | 61c02e56 | Jeff Cody | MSGUID page_83_data; /* unique id for scsi devices that
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298 | 203cdba3 | Jeff Cody | support page 0x83 */
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299 | 203cdba3 | Jeff Cody | } VHDXPage83Data; |
300 | 203cdba3 | Jeff Cody | |
301 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXVirtualDiskLogicalSectorSize { |
302 | 203cdba3 | Jeff Cody | uint32_t logical_sector_size; /* virtual disk sector size (in bytes).
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303 | 203cdba3 | Jeff Cody | Can only be 512 or 4096 bytes */
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304 | 203cdba3 | Jeff Cody | } VHDXVirtualDiskLogicalSectorSize; |
305 | 203cdba3 | Jeff Cody | |
306 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXVirtualDiskPhysicalSectorSize { |
307 | 203cdba3 | Jeff Cody | uint32_t physical_sector_size; /* physical sector size (in bytes).
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308 | 203cdba3 | Jeff Cody | Can only be 512 or 4096 bytes */
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309 | 203cdba3 | Jeff Cody | } VHDXVirtualDiskPhysicalSectorSize; |
310 | 203cdba3 | Jeff Cody | |
311 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXParentLocatorHeader { |
312 | 61c02e56 | Jeff Cody | MSGUID locator_type; /* type of the parent virtual disk. */
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313 | 203cdba3 | Jeff Cody | uint16_t reserved; |
314 | 203cdba3 | Jeff Cody | uint16_t key_value_count; /* number of key/value pairs for this
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315 | 203cdba3 | Jeff Cody | locator */
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316 | 203cdba3 | Jeff Cody | } VHDXParentLocatorHeader; |
317 | 203cdba3 | Jeff Cody | |
318 | 203cdba3 | Jeff Cody | /* key and value strings are UNICODE strings, UTF-16 LE encoding, no NULs */
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319 | 203cdba3 | Jeff Cody | typedef struct QEMU_PACKED VHDXParentLocatorEntry { |
320 | 203cdba3 | Jeff Cody | uint32_t key_offset; /* offset in metadata for key, > 0 */
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321 | 203cdba3 | Jeff Cody | uint32_t value_offset; /* offset in metadata for value, >0 */
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322 | 203cdba3 | Jeff Cody | uint16_t key_length; /* length of entry key, > 0 */
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323 | 203cdba3 | Jeff Cody | uint16_t value_length; /* length of entry value, > 0 */
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324 | 203cdba3 | Jeff Cody | } VHDXParentLocatorEntry; |
325 | 203cdba3 | Jeff Cody | |
326 | 203cdba3 | Jeff Cody | |
327 | 203cdba3 | Jeff Cody | /* ----- END VHDX SPECIFICATION STRUCTURES ---- */
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328 | 203cdba3 | Jeff Cody | |
329 | 28541d46 | Jeff Cody | typedef struct VHDXMetadataEntries { |
330 | 28541d46 | Jeff Cody | VHDXMetadataTableEntry file_parameters_entry; |
331 | 28541d46 | Jeff Cody | VHDXMetadataTableEntry virtual_disk_size_entry; |
332 | 28541d46 | Jeff Cody | VHDXMetadataTableEntry page83_data_entry; |
333 | 28541d46 | Jeff Cody | VHDXMetadataTableEntry logical_sector_size_entry; |
334 | 28541d46 | Jeff Cody | VHDXMetadataTableEntry phys_sector_size_entry; |
335 | 28541d46 | Jeff Cody | VHDXMetadataTableEntry parent_locator_entry; |
336 | 28541d46 | Jeff Cody | uint16_t present; |
337 | 28541d46 | Jeff Cody | } VHDXMetadataEntries; |
338 | 28541d46 | Jeff Cody | |
339 | 625565d2 | Jeff Cody | typedef struct VHDXLogEntries { |
340 | 625565d2 | Jeff Cody | uint64_t offset; |
341 | 625565d2 | Jeff Cody | uint64_t length; |
342 | 0a43a1b5 | Jeff Cody | uint32_t write; |
343 | 0a43a1b5 | Jeff Cody | uint32_t read; |
344 | 0a43a1b5 | Jeff Cody | VHDXLogEntryHeader *hdr; |
345 | 0a43a1b5 | Jeff Cody | void *desc_buffer;
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346 | 0a43a1b5 | Jeff Cody | uint64_t sequence; |
347 | 625565d2 | Jeff Cody | uint32_t tail; |
348 | 625565d2 | Jeff Cody | } VHDXLogEntries; |
349 | 625565d2 | Jeff Cody | |
350 | 1a848fd4 | Jeff Cody | typedef struct VHDXRegionEntry { |
351 | 1a848fd4 | Jeff Cody | uint64_t start; |
352 | 1a848fd4 | Jeff Cody | uint64_t end; |
353 | 1a848fd4 | Jeff Cody | QLIST_ENTRY(VHDXRegionEntry) entries; |
354 | 1a848fd4 | Jeff Cody | } VHDXRegionEntry; |
355 | 1a848fd4 | Jeff Cody | |
356 | 28541d46 | Jeff Cody | typedef struct BDRVVHDXState { |
357 | 28541d46 | Jeff Cody | CoMutex lock; |
358 | 28541d46 | Jeff Cody | |
359 | 28541d46 | Jeff Cody | int curr_header;
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360 | 28541d46 | Jeff Cody | VHDXHeader *headers[2];
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361 | 28541d46 | Jeff Cody | |
362 | 28541d46 | Jeff Cody | VHDXRegionTableHeader rt; |
363 | 28541d46 | Jeff Cody | VHDXRegionTableEntry bat_rt; /* region table for the BAT */
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364 | 28541d46 | Jeff Cody | VHDXRegionTableEntry metadata_rt; /* region table for the metadata */
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365 | 28541d46 | Jeff Cody | |
366 | 28541d46 | Jeff Cody | VHDXMetadataTableHeader metadata_hdr; |
367 | 28541d46 | Jeff Cody | VHDXMetadataEntries metadata_entries; |
368 | 28541d46 | Jeff Cody | |
369 | 28541d46 | Jeff Cody | VHDXFileParameters params; |
370 | 28541d46 | Jeff Cody | uint32_t block_size; |
371 | 28541d46 | Jeff Cody | uint32_t block_size_bits; |
372 | 28541d46 | Jeff Cody | uint32_t sectors_per_block; |
373 | 28541d46 | Jeff Cody | uint32_t sectors_per_block_bits; |
374 | 28541d46 | Jeff Cody | |
375 | 28541d46 | Jeff Cody | uint64_t virtual_disk_size; |
376 | 28541d46 | Jeff Cody | uint32_t logical_sector_size; |
377 | 28541d46 | Jeff Cody | uint32_t physical_sector_size; |
378 | 28541d46 | Jeff Cody | |
379 | 28541d46 | Jeff Cody | uint64_t chunk_ratio; |
380 | 28541d46 | Jeff Cody | uint32_t chunk_ratio_bits; |
381 | 28541d46 | Jeff Cody | uint32_t logical_sector_size_bits; |
382 | 28541d46 | Jeff Cody | |
383 | 28541d46 | Jeff Cody | uint32_t bat_entries; |
384 | 28541d46 | Jeff Cody | VHDXBatEntry *bat; |
385 | 28541d46 | Jeff Cody | uint64_t bat_offset; |
386 | 28541d46 | Jeff Cody | |
387 | c3906c5e | Jeff Cody | bool first_visible_write;
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388 | 28541d46 | Jeff Cody | MSGUID session_guid; |
389 | 28541d46 | Jeff Cody | |
390 | 625565d2 | Jeff Cody | VHDXLogEntries log; |
391 | 625565d2 | Jeff Cody | |
392 | 28541d46 | Jeff Cody | VHDXParentLocatorHeader parent_header; |
393 | 28541d46 | Jeff Cody | VHDXParentLocatorEntry *parent_entries; |
394 | 28541d46 | Jeff Cody | |
395 | 28541d46 | Jeff Cody | Error *migration_blocker; |
396 | 1a848fd4 | Jeff Cody | |
397 | 1a848fd4 | Jeff Cody | QLIST_HEAD(VHDXRegionHead, VHDXRegionEntry) regions; |
398 | 28541d46 | Jeff Cody | } BDRVVHDXState; |
399 | e8d4e5ff | Jeff Cody | |
400 | 4f18b782 | Jeff Cody | void vhdx_guid_generate(MSGUID *guid);
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401 | 4f18b782 | Jeff Cody | |
402 | c3906c5e | Jeff Cody | int vhdx_update_headers(BlockDriverState *bs, BDRVVHDXState *s, bool rw, |
403 | c3906c5e | Jeff Cody | MSGUID *log_guid); |
404 | c3906c5e | Jeff Cody | |
405 | 4f18b782 | Jeff Cody | uint32_t vhdx_update_checksum(uint8_t *buf, size_t size, int crc_offset);
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406 | e8d4e5ff | Jeff Cody | uint32_t vhdx_checksum_calc(uint32_t crc, uint8_t *buf, size_t size, |
407 | e8d4e5ff | Jeff Cody | int crc_offset);
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408 | e8d4e5ff | Jeff Cody | |
409 | e8d4e5ff | Jeff Cody | bool vhdx_checksum_is_valid(uint8_t *buf, size_t size, int crc_offset); |
410 | e8d4e5ff | Jeff Cody | |
411 | 0a43a1b5 | Jeff Cody | int vhdx_parse_log(BlockDriverState *bs, BDRVVHDXState *s, bool *flushed); |
412 | e8d4e5ff | Jeff Cody | |
413 | 8adc5233 | Jeff Cody | int vhdx_log_write_and_flush(BlockDriverState *bs, BDRVVHDXState *s,
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414 | 8adc5233 | Jeff Cody | void *data, uint32_t length, uint64_t offset);
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415 | 8adc5233 | Jeff Cody | |
416 | 4f18b782 | Jeff Cody | static inline void leguid_to_cpus(MSGUID *guid) |
417 | e8d4e5ff | Jeff Cody | { |
418 | e8d4e5ff | Jeff Cody | le32_to_cpus(&guid->data1); |
419 | e8d4e5ff | Jeff Cody | le16_to_cpus(&guid->data2); |
420 | e8d4e5ff | Jeff Cody | le16_to_cpus(&guid->data3); |
421 | e8d4e5ff | Jeff Cody | } |
422 | e8d4e5ff | Jeff Cody | |
423 | 4f18b782 | Jeff Cody | static inline void cpu_to_leguids(MSGUID *guid) |
424 | 4f18b782 | Jeff Cody | { |
425 | 4f18b782 | Jeff Cody | cpu_to_le32s(&guid->data1); |
426 | 4f18b782 | Jeff Cody | cpu_to_le16s(&guid->data2); |
427 | 4f18b782 | Jeff Cody | cpu_to_le16s(&guid->data3); |
428 | 4f18b782 | Jeff Cody | } |
429 | 4f18b782 | Jeff Cody | |
430 | 0f48e8f0 | Jeff Cody | void vhdx_header_le_import(VHDXHeader *h);
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431 | 0f48e8f0 | Jeff Cody | void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h);
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432 | 0f48e8f0 | Jeff Cody | void vhdx_log_desc_le_import(VHDXLogDescriptor *d);
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433 | 0f48e8f0 | Jeff Cody | void vhdx_log_desc_le_export(VHDXLogDescriptor *d);
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434 | 0f48e8f0 | Jeff Cody | void vhdx_log_data_le_export(VHDXLogDataSector *d);
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435 | 0f48e8f0 | Jeff Cody | void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr);
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436 | 0f48e8f0 | Jeff Cody | void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr);
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437 | c325ee1d | Jeff Cody | void vhdx_region_header_le_import(VHDXRegionTableHeader *hdr);
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438 | c325ee1d | Jeff Cody | void vhdx_region_header_le_export(VHDXRegionTableHeader *hdr);
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439 | c325ee1d | Jeff Cody | void vhdx_region_entry_le_import(VHDXRegionTableEntry *e);
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440 | c325ee1d | Jeff Cody | void vhdx_region_entry_le_export(VHDXRegionTableEntry *e);
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441 | c325ee1d | Jeff Cody | void vhdx_metadata_header_le_import(VHDXMetadataTableHeader *hdr);
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442 | c325ee1d | Jeff Cody | void vhdx_metadata_header_le_export(VHDXMetadataTableHeader *hdr);
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443 | c325ee1d | Jeff Cody | void vhdx_metadata_entry_le_import(VHDXMetadataTableEntry *e);
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444 | c325ee1d | Jeff Cody | void vhdx_metadata_entry_le_export(VHDXMetadataTableEntry *e);
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445 | c3906c5e | Jeff Cody | int vhdx_user_visible_write(BlockDriverState *bs, BDRVVHDXState *s);
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446 | c3906c5e | Jeff Cody | |
447 | 203cdba3 | Jeff Cody | #endif |